Tonks' voice popped up in his head at this point, asking him all over again why he was even bothering to help Draco. Pretty much exactly what Narcissa was saying now; he was wealthy, he didn't have to work, maybe he didn't want to work...

He sighed very quietly so it wouldn't be heard and tried to keep calm as he spoke. "But what if he wants something more than that? Staying out here... it isn't good for anyone, never mind a young man Draco's age. Speaking as someone who knows what it's like to be isolated for a long time." Blunt.